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Dear Rob,<br>
<br>
Great idea! Some suggesttions to make full use of the "extra VNA". <br>
* Add a buffer amplifier to the oscillator (to increase output-power
and protect the DDS)<br>
* Provide three small RF connectors (SMA e.g.); one connected to the
RF-source, one connected to the cosine-mixer (reference) and one to the
sine-mixer (input)<br>
<br>
By providing two measurement ports (reference&input), one can use
an external directional coupler allowing full S-parameter tests! This
means, it will be possible to measure both passive and active devices.
For further reading have a look at this application-note from Agilent:
<a class="moz-txt-link-freetext" href="http://cp.literature.agilent.com/litweb/pdf/5965-7917E.pdf">http://cp.literature.agilent.com/litweb/pdf/5965-7917E.pdf</a><br>
<br>
The suggestion of Ignacio EB4APL seems interesting as well. However, I
would opt for a remote controlled antenna tuner directly at the
antenna. This will keep a 50 Ohm load at the coaxial line.<br>
<br>
Good luck with the Phoenix design! 73s Jeroen PE1RGE<br>
<br>
<br>
<br>
Rob Frohne wrote:<br>
<blockquote cite="mid44F30DAE.4040209@wwc.edu" type="cite">
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Hi Everyone,<br>
<br>
It seems to me that we can include without much overhead at all vector
network analyzer capabilities in the Pheonix board. While there are
other stand alone VNA options available (N2PK and IW3HEV), I think the
large dynamic range, and other good specs of the Pheonix will yield a
better VNA than those options. The block diagram for a narrow band VNA
that fits our architecture is shown in a sketch I put on the web at: <a
href="http://frohro-g5.wwc.edu/%7Efrohro/VNA.jpg">Vector Network
Analyzer Block Diagram</a><br>
<br>
Have a look at it, and share your thoughts with us!<br>
<br>
Tnx & 73,<br>
<br>
Rob, KL7NA<br>
<pre class="moz-signature" cols="72">--
Rob Frohne, Ph.D., P.E.
E.F. Cross School of Engineering
Walla Walla College
100 SW 4th Street
College Place, WA 99324
(509) 527-2075 <a class="moz-txt-link-freetext"
href="http://www.wwc.edu/%7Efrohro">http://www.wwc.edu/~frohro</a>
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Ing. Jeroen Bastemeijer
Delft University of Technology
Department of Electrical Engineering
Electronic Instrumentation Laboratory
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2628 CD Delft
The Netherlands
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Fax: +31.15.27.85755
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